<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<img src="image/01.jpg" id="01_img_downLoad">
<script language="javascript" type="text/javascript">
var img=document.getElementById("01_img_downLoad");
img.onclick=function(){
	alert("Welcome!!");
}
</script>
</body>
</html>